Remembering ON/OFF states in Lingo

Question

I have a series of images 71 total. Each set of images consists of a transparent PNG file the "off" state and a regular PNG file the "on state". I need a presentation that initially has all of the images in the off state but each one gets turned on with a click. Subsequently another click would turn it back off. There are several of these buttons on each page and each one of them may or may not be turned on/off at any time.  As long as I remain on that frame there are no issues, but when I advance to another marker (because not all the images will fit on one page) and return all the buttons return to the initial off state.
I am having trouble with the Lingo. I am using if/then statements on the sprite itself to swap the cast member out and even tried declaring a variable on the Sprite script as well. I was able to successfully remember only 1 button state by using an if then statement in an On EnterFrame so clearly I am not doing this correctly.
Can anyone provide me with some sample code and where to place it in my movie so that I can retain click settings on multiple buttons when navigating back and forth in my movie?

Answer 1

If you want to retain the member state when you leave the span of the sprite then you will need to store the state information in a Global variable. 
You will need a Movie script to setup the global variable and a Behavior that accesses the variable to determine which member to assign to each sprite.
-- Movie Script
global  gBtnStates
on prepareMovie
  gBtnStates = []
  gBtnStates[71] = 0    -- Will fill list with 71 zeros
end
The Behavior uses a GetPropertyDescriptionList() handler to assign an index position into gBtnStates.
-- Button with state memory Behavior
property  pSprite  -- this sprite
property  pIndex  -- index position in gBtnStates for the member state. 0 or 1
global  gBtnStates
On GetPropertyDescriptionList me
  Props = [:]
  Props[#pIndex] = [#default:1, #format:#integer,  #comment:"Member state Index."]
  return Props
end GetPropertyDescriptionList
on beginSprite me
  pSprite = sprite(me.spriteNum)
  me.changeMember()
end beginSprite
on mouseDown me
  gBtnStates[pIndex] = Not gBtnStates[pIndex]
  me.changeMember()
end mouseDown
on changeMember me
  if gBtnStates[pIndex]  then
    pSprite.member = member("member1")
  else
    pSprite.member = member("member0")
  end if
end mouseDown